This conservatory was constructed with two dwarf wall heights. A close up detail of the external cill detail showing the different heights.

 

 

Here you can see how the frames and corner post are added.

 

 

The cill is joined underneath by stainless steel draw bolts for added strength.

 

 

Here, a top view of the cill joined tightly together, a perfect fit.

 

 

Notice the depth of the hardwood cill and the drip detail.